OK, don't worry i'll consider these details next time i create e new topic.....

Varun, the question is addressed to you Bcause you know everything concerning the performance of my PC..., so, i saw that there were many Adobe Photoshop but donno what to choose, having in mind that while installing the progam, it might have negative consequents on my computer.....

Yeah, that's true but I'll start off by advising you to abstain yourself from aquiring pirated software. The second thing is that if you only want to add plain text to images, Paint isn't a bad software at all.

On the other hand, if you're really going for serious image editing then Paint.NET and GIMP are good and FREE alternatives to Adobe Photoshop.

Finally, you should consider upgrading your 512 MB of RAM to something like 2 GB to ensure a decent performance for image editing.